Search for Missing Charmonium States in Bmeson Decays.pdfVIP

Search for Missing Charmonium States in B-meson Decays 2 Y. F. Gu∗ 0 0 2 n u J Department of Technical Physics, School of Physics, Peking University, Beijing 100871, China 1 and 1 Institute of High Energy Physics, Beijing 100039, China v 2 0 0 6 0 April 26, 2002 2 0 / h p - p e h : v i Abstract X r The recent progress in experiments at B-factories suggests an opportunity to search a ′ 1 1 for the missing charmonium states η (2 S ) and h (1 P ). The feasibility of such a c 0 c 1 search in B-meson decays are discussed. PACS: 14.40.Gx, 13.25.Hw, 13.25.Gv, 13.40.Hq ∗Email: guyf@mail.ihep.ac.cn 1 1. Introduction Of the lowest charmonium states with radial quantum number n=1 and 2 below ′ 1 1 the open charm threshold, two singlet states, the η (2 S ) and the h (1 P ), are still c 0 c 1 listed by the Particle Data Group in ref.[1] as missing or needing confirmation. Much effort has been devoted to search for these states over past two decades. The Crystal Ball experiment claimed the first and also the only observation of a candidate ′ ′ for the η in the inclusive photon spectrum of the , with a mass of 3592 ± 5 MeV and c a total width of less than